They needed to get to a place called the House of Hades (or Pluto, as the Romans called him; or as Hazel liked to think of him: the World’s Worst Absent Father).
— Page 5

She laughed, and the sound sent a shock wave through the water. The wailing faded to background noise. Annabeth wondered if anyone had ever laughed in Tartarus before—just a pure, simple laugh of pleasure. She doubted it.
— Page 39

The House of Hades is the fourth in the Heroes of Olympus series by Rick Riordan, and it won’t be the last. There’s a cliffhanger to work with from book three and the sense of foreboding that something bad will happen. Two characters trying to find a way out of Tartarus does seem to merit the thought.
The group of demigods is separated. Percy and Annabeth are trying to find the Doors of Death from the inside and the others do the same on the outside. Naturally there’s a prophecy involved and it doesn’t sound good. But as long as there’s hope and laughter – and the occasional godly help – they stand a chance of succeeding. I’m crossing my fingers and reading on.

Which series would you never turn your back on, even if you constantly feared for the characters? Sound off in the comments!